# # 身份验证
#
# username = input('请输入用户名：')
# password = input('请输入口令：')
#
# if username == 'admin' and password =='admin':
#     print('身份验证成功！')
# else:
#     print('身份验证失败！')
#
#
#
#
# # 分段函数求值
#
# x = float(input('x = '))
# if x > 1:
#     y = 3 * x -5
# elif x >= -1:
#     y = x + 2;
# else:
#     y = 5 * x + 3
# print('f(%.2f) = %.2f' % (x,y))
#


# # 英制单位与公制单位相互转化
# value = float(input('请输入长度：'))
# unit = input('请输入单位：')
# if unit == 'in' or unit == '英寸':
#     print('%f英寸 = %f厘米' %(value ,value * 2.54))
# elif unit == 'cm' or unit == '厘米':
#     print('%f厘米 = %f英寸' %(value,value / 2.54))
# else:
#     print('请输入有效单位')
#
#
#
#
# from random import randint
#
# face = randint(1, 6)
# if face == 1:
#     result = '唱首歌'
# elif face == 2:
#     result = '跳个舞'
# elif face == 3:
#     result = '学狗叫'
# elif face == 4:
#     result = '做俯卧撑'
# elif face == 5:
#     result = '念绕口令'
# else:
#     result = '讲冷笑话'
#
# print(result)
#
#
#
# score = float(input('请输入成绩：'))
# grade = 'Error'
# if score >= 90:
#     grade = 'A'
# elif score >= 80:
#     grade = 'B'
# elif score >= 70:
#     grade = 'C'
# elif score >= 60:
#     grade = 'D'
# else:
#     grade = "E"
#
# print('对应的成绩等级是：', grade)


import math

a = float(input('a ='))
b = float(input('b = '))
c = float(input('c = '))
if a + b > c and a + c > b and b + c > a:
    print('周长 ： %f' % (a+b+c))
    p = (a + b + c) / 2
    area = math.sqrt(p * (p - a) * (p - b) * (p - c))
    print('面积：%f ' %(area))
else:
    print('不能构成三角形')



salary = float(input('本月收入：'))
insurance = float(input('五险一金：'))
diff = salary - insurance - 3500

rate = 0
deduction = 0

if diff <= 0:
    rate = 0
    deduction = 0
elif diff < 1500:
    rate = 0.03
    deduction = 0
elif diff < 4500:
    rate = 0.1
    deduction = 105
elif diff < 9000:
    rate = 0.2
    deduction = 555
elif diff < 35000:
    rate = 0.25
    deduction = 1005
elif diff < 55000:
    rate = 0.3
    deduction = 2755
elif diff < 80000:
    rate = 0.35
    deduction = 5505
else:
    rate = 0.45
    deduction = 13505
tax = abs (diff * rate - deduction)
print('个人所得随：￥ %.2f 元' % tax)
print('实际到手收入 ： ￥ %.2f 元' % (diff + 3500 - tax))








